China
Africa
Explore chapters and articles related to this topic
Materials for motorcycles
Published in Andrew Livesey, Motorcycle Engineering, 2021
6061 Aluminum Alloy – Aluminum alloyed with silicone and magnesium to provide a relatively low-cost and very lightweight material. It is very ductile and lends itself to the hydro-forming of the nonround shapes used for some frames. It is readily weldable and used for a wide range of applications in other industries. It may be heat-treated using the T6 process.
Kinetics of Laser Surface Engineering of Three Aluminum Alloys
Published in T. S. Srivatsan, T. S. Sudarshan, K. Manigandan, Manufacturing Techniques for Materials, 2018
Sourabh Biswas, Sandip P. Harimkar
The 6061 aluminum alloy is one of the most popular commercial alloys of the 6xxx series aluminum alloys. The typical chemical composition of the 6061 alloy is given in Table 10.2 [4]. The 6061 alloy is reported to be the preferred material for applications in general-purpose structural, passenger railroad cars and movable radio telescopes [37]. The distinguishable properties of this alloy are its superior corrosion resistance, stress-corrosion cracking resistance, weldability, and formability compared to other precipitation-hardened alloys. The cost of production for the 6061 alloy is relatively lower than that for the 2024 aluminum alloy because of the greater availability of silicon compared to copper. Hence, the popularity of the 6061 aluminum alloy often supersedes the 2024 aluminum alloy, although the maximum peak aged strength achievable is only about two-thirds the strength of the 2024 aluminum alloy, as observed from Table 10.2 [38].
Effect of MgO micro-powder on the characteristics of micro-arc oxidation coatings
Published in Surface Engineering, 2019
Ping Wang, Ze Yu Gong, Jie Hu, Jun Pu, Wen Jie Cao
6061 aluminium alloy is a kind of reinforced alloy with high heat treatment strength, which has excellent machining performance and good welding characteristics. Its main elements are Mg and Si, also Mg2Si phase can be formed in the heat treatment, while Mg2Si can melt into aluminium to achieve the effect of artificial age-hardening [1,2]. So 6061 aluminium alloy can be applied in aerospace, electronics, automotive, construction and other industries. But low surface hardness and effortless to be corroded limit its application. For example, an automobile body manufactured by 6061 aluminium alloy without surface treatment is easy to corrode; also, an aircraft rotor manufactured by 6061 aluminium alloy without surface treatment will lead to deformation because of the poor thermal shock resistance [3]. Micro-arc oxidation (MAO) technology began in 1970s, and now the technology is mature. MAO can be used to produce ceramic coating in situ on valve metals surface (Al, Mg, Ti, etc.) to strengthen the performance of the hardness, corrosion resistance, high temperature resistance and other properties [4,5]. Through MAO treatment, 6061 aluminium alloy can overcome these defects and improve the surface properties of MAO coating obviously. Therefore, the products of 6061 aluminium alloy treated by MAO are used in the automotive industry for the fabrication of automotive component such as panel, wheel and the car structure. In aerospace, it also can be used for the aircraft’s propeller, rotor, the bulkhead of the spaceship, etc. [6,7]. The theory of MAO is not mature enough in previous researches, a lot of high quality researches on MAO began after 2009. So it has not been widely used [8].
Low-temperature properties of nematic liquid crystal materials for display
Published in Liquid Crystals, 2021
Na Gao, Shuai Jing, Xiangming Kong, Nan Wu, Keming Wu, Jingjing Sun, Minglei Cai, Tongzhou Zhao, Changyong Yang, Hongyu Xing, Wenjiang Ye
The refrigeration system includes semiconductor refrigeration sheet and chamber. Semiconductor refrigerating sheet is 40×40 mm double layer refrigerating sheet, which has advantages of small size, no noise, no refrigerator, no moving parts, high reliability. The chamber is 6061 aluminium alloy, and its thermal conductivity is about 200 W/(m·K). Although the thermal conductivity is not as good as that of pure copper (~400 W/(m·k)), it is easy to process and not easy to rust. The cooling system includes water cooling head, water pump, water exhaust and cooling fan. The system uses water cooling liquid to heat the hot end of semiconductor refrigeration sheet.
Influence of processing parameters on microstructure and mechanical response of a high-pressure die cast aluminum alloy
Published in Materials and Manufacturing Processes, 2019
Mayank Agarwal, Rajeev Srivastava
Oxidation effect on the components can be observed from the XRD report (Fig. 5(b)) and also from the components images (Fig. 5a). Development of these oxide layers strongly depends on the reinforcement and can be analyzed by RIF (calculating by Eq. 4).[16,19] Depending on the value of RIF, oxide layer formation may be decreased when the value is near 1.0. Whereas, oxide formation also depends on the type of reinforcement and pouring temperature. Accordingly, as in Fig. 5(b), these oxides are majorly standing for α-Al particles with magnesium and carbon. Some amount of silicon was also observed with carbon and due to these layers of the components rate of heat transfer may by reduces which affects the surface quality. The combined effect of reinforcement and pouring temperature is shown in Fig. 6(a) as a function of RIF for components with a time of the stroke. It can be observed that when the time of the stroke was decreased, the value of RIF increases. RIF reaches to 0.992 which is closer to 1.0, when pouring temperature is near to 668°C and in this case, stroke time is near to 4 s. Basically, this parameter shows a positive effect of the semisolid stage and proper mixing of reinforcement particles. Due to the small size of powder particles, melting of reinforcement is quite easy, and effect of this also confirmed by the density measurement as shown in Fig. 6(b). For RIF value 0.992, the density of the component is near 2.71 g/cm3 which is 0.37% higher than the theoretical density of the bulk 6061 aluminum alloy. Initially, RIF value is low due to the nonuniform dispersion of reinforcement and with less wetting of the particles by the melt. Further, the process also affected by overwhelming the surface tension of the slurry, agglomeration, and sedimentation of the particles inside the melt.